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Subsequent Events
9 Months Ended
Sep. 30, 2021
Subsequent Events [Abstract]  
Subsequent Events Subsequent EventsIn September 2021, the holders of the Floating Rate Capital Securities Series A and Series B were notified that such securities would be redeemed at the principal amount plus accrued and unpaid interest on October 15, 2021. In 1997, the Corporation established two statutory business trusts, NTC Capital I and NTC Capital II, for the sole purpose of issuing the Floating Rate Capital Securities, Series A due in January 2027 and the Floating Rate Capital Securities, Series B due in April 2027, respectively. The sole assets of the trusts were the subordinated debentures of Northern Trust Corporation that had the same interest rates and maturity dates as the corresponding distribution rates and redemption dates of the Floating Rate Capital Securities. On October 15, 2021, concurrently with the redemption of the Floating Rate Capital Securities Series A and B, the corresponding subordinated debentures were fully redeemed for $278.8 million principal amount plus accrued and unpaid interest, with $154.9 million attributable to the Series A subordinated debenture and $123.9 million attributable to the Series B subordinated debenture